<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    #app {
        position: relative;
        height: 100vh;
        border: 1px solid blue;
        margin: 2em;
    }

    .box {
        height: 100px;
        width: 100px;
        border: 1px solid red
    }

    .img {
        position: absolute;
        height: 100%;
        border: 1px solid green;
        object-fit: cover;
        width: 100%;
        z-index: 99;
        top: 0;
        left: 0;
    }
</style>
<body style="margin: 0;padding: 0">
<div id="app">
    <div class="box">

    </div>
    <div class="box">

    </div>
    <img class="img" src="./40-1-02.png">

</div>
</body>
</html>
